diff options
Diffstat (limited to 'ldlinux.asm')
| -rw-r--r-- | ldlinux.asm | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/ldlinux.asm b/ldlinux.asm index 2a93985a..ad82045b 100644 --- a/ldlinux.asm +++ b/ldlinux.asm @@ -126,6 +126,8 @@ HighMemSize resd 1 ; End of memory pointer (bytes) RamdiskMax resd 1 ; Highest address for a ramdisk KernelSize resd 1 ; Size of kernel (bytes) SavedSSSP resd 1 ; Our SS:SP while running a COMBOOT image +ClustPerMoby resd 1 ; Clusters per 64K +ClustSize resd 1 ; Bytes/cluster KernelName resb 12 ; Mangled name for kernel ; (note the spare byte after!) RootDir equ $ ; Location of root directory @@ -142,7 +144,6 @@ DirScanCtr resw 1 ; Used while searching directory DirBlocksLeft resw 1 ; Ditto EndofDirSec resw 1 ; = trackbuf+bsBytesPerSec-31 RunLinClust resw 1 ; Cluster # for LDLINUX.SYS -ClustSize resw 1 ; Bytes/cluster SecPerClust resw 1 ; Same as bsSecPerClust, but a word NextCluster resw 1 ; Pointer to "nextcluster" routine BufSafe resw 1 ; Clusters we can load into trackbuf @@ -150,7 +151,6 @@ BufSafeSec resw 1 ; = how many sectors? BufSafeBytes resw 1 ; = how many bytes? EndOfGetCBuf resw 1 ; = getcbuf+BufSafeBytes KernelClust resw 1 ; Kernel size in clusters -ClustPerMoby resw 1 ; Clusters per 64K FClust resw 1 ; Number of clusters in open/getc file FNextClust resw 1 ; Pointer to next cluster in d:o FPtr resw 1 ; Pointer to next char in buffer @@ -680,12 +680,12 @@ fat_load_done: ; mov di,[bsBytesPerSec] ; Used a lot below - mov al,[bsSecPerClust] ; We do this in the boot - xor ah,ah ; sector, too, but there + movzx eax,byte [bsSecPerClust] ; We do this in the boot + ; sector, too, but there mov [SecPerClust],ax ; wasn't space to save it mov si,ax ; Also used a lot... mul di - mov [ClustSize],ax ; Bytes/cluster + mov [ClustSize],eax ; Bytes/cluster mov bx,ax mov ax,trackbufsize xor dx,dx @@ -957,10 +957,11 @@ all_read: ; ; Compute some parameters that depend on cluster size ; - mov dx,1 - xor ax,ax + xor eax,eax + cwd ; DX <- 0 + inc dx ; DX:AX <- 64K div word [ClustSize] - mov [ClustPerMoby],ax ; Clusters/64K + mov [ClustPerMoby],eax ; Clusters/64K ; ; Now we're all set to start with our *real* business. First load the |